Disk mill



S. STEINMETZ.

DISK MILL.

APPLICATION FILED AUG-26, 1921.

Patented Sept. 199 1922o ltizazs STEFAN STEINMET'Z, OF BERLIN, GERMANY.

DISK MILL.

Application vflied August 26, 1921. Serial No. 495,526.

'To aZ-Z 'whom it may concern:

Be it known that I, STEFAN SimnMn'rz,

current of air, which passes in an axial direction through the grinding chamber, can be a citizen of the German Republic,and a resi- \`produced.

dent of Berlin, Germany, have invented certain new and useful Improvements in Disk Mills, (for which I'have obtained a patent in Germany, No. 297,385, dated June 12, 1915) tion.

The grinding device which forms sub-I .ject matter of the present invention enables the corn or a previously rough ground portion of the sameto b e ground down to the iinished state without aloss of grist such as cannot be avoided when it is conveyed to the sieves and further grinding machines by means of conveyors such as, for example, elevators, worm conveyors and the like.

Y For this purpose the disk mill is combined V with a sifting device-in the following man, ner. A curved sieve is fitted in the grinding v chamber which is suitably enlarged'for -this purpose and oneof the 'grinding disks, which rotate in opposite directions, carries blades or beaters which throw the product of the grinding disks against the sieve. A furthercharacteristic of the -invention is that the grist, i. e., the residueremaining inside the grinding mill, after having passed once through the grinding disks is again returned to the inlet so that said residue can circulate .continuously through the inlet and between the grinding surfaces, without leaving the machine, until it is ground down to the finished our ready for baking. Y

In order to attain the Object desired the grinding disks are suitably provided with two diii'erent grinding zones and in such a manner that the one zone has chiefly a cutting action on the grist and the other chiefly disks which gives the grist leaving the grinding surfaces a motion in adirection which is opposed to that in which it is moved by the blades.

Finally in acordance also with the present invention the grinding chamber is suitably cooled in the following manner. In addition to the current of air produced by the beaters arrangements are made whereby a further of which the followingis a specifica-f' With the complete machine, which occupies but little space and requires a correspondingly small amount. of power and of which'both the initial cost and costs of running and upkeep are valso correspondingly small, a our is produced which makes va .bread which is nutritious and easy to bake as it contains all the valuable nourishing constituents of the corn in a completely disintegrated condition.

. One construction of a, grinding mill in accordance with the present invention is illustrated byway of example in the accompanylingdrawings in Whichlig. 1 is a cross section through the mill caslng, l

Fig. 2 a sectional View through the whole grinding mill,

F 3 a side View of the grinding mill,

F ig. 4 a plan and partly horizontal section through Fig. 2, and finally Fig. 5 is a. plan of one of the blades seen from the direction of the arrow X in Fig.` 4.

Referring to the drawings, a and b are the known grinding disks which are arranged in the grinding chamber 0 and which, also inl for example, stone, artificial stone, steel or other metal orv the like.

According to the invention the grinding chamber c is enlarged,l preferably in spiral form, so as to enclose the grinding disks but at a certain distance from them. The annular space thus produced contains a number of blades or beaters g and a curved sieve 71, against which the ground material coming from the grinding surfaces of the disks 'a and b is driven. The blades or beaters g are fixed to theperiphery of one (a in the drawing) of the rotating grinding disks and are suitably of such a length that they extend over both the grinding disks, so that they can coact with a suiliciently wide sieve h. These blades or beaters g can be provided with known means, for example they may consist of bent and slit parts (see Fig. 5) or they may be bentin the form of screw-like surfaces, whereby they not only throw the lOl ground product against the sieve h, but also give it a motion. in a fixed direction parallel to the axis, of the grinding disks.

A more complete distribution over the surface of the sieve of' the product delivered from the grinding disks can be obtained ifthe periphery of the second grinding disk t is fitted with a cone-shaped ringz' which d1- verts the ground product towards the left hand side of the blades g while the latter on account of their method of construction 'as described above carry the product to the right hand side. l

The fine portions of the ground product which are driven through the sieve lz. fall in the direction ofthe arrow (Fig. 1) through the outletk while the remainder or residue finds its way back through the opening m (Figs. 1, 3 and 4c), which is provlded 1n one of the Walls of the grinding chamber, and the channel n to the inlet and thus lto the grinding disksw and b. rlhe blades g act on the one hand so as to throw the product against the sieve and on the other side of the casing as scoops so as to convey the resi-- due through the 'opening minto the channel n..

The disks a; and b advantagqously rotate 'in opposite directions which 1s in itself so 1m own. c Since the grinding mill is to be used chiey for theproduction of whole meal and is to produce a larger output precautions must be taken for sufliciently cooling the grinding members in case the current of air produced by the blades alone is not enough. lnthis case it is advantageous to ass a second current of air entering throng the inlet d through the grinding chamber c. This inay be'done by connecting a pipe leading to a fan to the connection' o. Inorder that the grinding surfaces ma curved sieve, so that the wings lift the ground material leaving the disks and throw it vagainst the sieve.

2. A disk mill for ground grain, bran an the like, comprismg .1n comblnation a spirally formed grinding,

also be e'ectivelyv .ventilated small openings wz may be progrinding corn, rough f l chamber, oppositely rotating grinding disks, arranged in said grinding chamber, a plurality' of blades or beaters tangentially disposed at the'outer periphery of one hof said rinding disks `and extending over both isks, a curved sieve mounted on one slde of said spirally formed grindin chamber and adapted to receive the groun products, flung upwardly by said 'blades or beaters, a lateral opening, arranged in the sidewall of the grinding chamber within reach of said blades or beaters and a duct or channel connecting said lateral opening of the grinding chamber to the charging hopper and being jadapted to return the residue griet into the latter in' order to' be ground overvagain.

3. A disk mill for rinding grain, meal, bran and the like, emhodying throw wings on the outer circumference of one of the turning vmill disks, said wings being tangentially arranged and extending across both disks, a spirally .formed grinding chamber enclosing the wings and provided with a curved sieve, so .that the wings lift the ground material leaving the disks and throw it vagainst the sieve, sald grinding chamber having a side opening in its side wall within throwing reach of the wings, and a channel for the return of the residue tothe inlet hopper.

4. A disk mill for rinding grain, meal,I *bran and the like, em odying throw wings on the outer circumference of one of the turning mill disks, said wings being tangentially arranged and extending across both disks, a spirally formed grinding chamber enclosing the wings and provided with a curved sieve, so that the wings lift the ground material leaving the disks and throw it against the sieve, one of the grinding disks having a conical ring on its circumference to retain the ground product on one side of the' grinding chamber, said throw lwings transferring such product to the opposite side. A

5. A disk mill for grinding grain, meal, bran and the like, embodying throw wings on the outer circumference of one of the .turning mill disks, said wings being tangentially arranged and extendin across both disks, a spirally formed grinding chamber enclosing the wings 'and provided with a curved sieve, so that. the wings lift the ground material leaving the disks and throw it against the sieve, and means for forcing fresh air through said mill.

STEFAN STENMETZ. Witnesses: p

Ur'ro F. BRUNN, PAUL Baarnse.

ln testimony whereof l allix my signature lin presenceof two witnesses.

ae 'l lill@ iis 

